upstash/context7 at 55.9K Stars: MCP Server Injects Version-Specific Documentation Into LLM Prompts to Eliminate Hallucinated APIs

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Context7 pulls up-to-date, version-specific documentation and code examples straight from source and places them directly into LLM prompts via MCP. The two core tools — resolve-library-id and query-docs — let any MCP-compatible client (Cursor, Windsurf, Claude Code) retrieve accurate docs instead of relying on training data. Free API key available at context7.com for higher rate limits.